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Revenues, Contract Assets and Contract Liabilities (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating revenues:        
Sales related to contract liabilities $ 162 $ 1,903 $ 4,203 $ 6,381
Remaining performance obligation $ 269,100   $ 269,100  
Performance obligation, percentage 100.00%   100.00%  
Performance obligation expected to be satisfied in the first year $ 92,800   $ 92,800  
Performance obligation expected to be satisfied in the second year 136,800   136,800  
Performance obligation expected to be satisfied thereafter $ 39,600   $ 39,600